Periodic table and energy

• How is the periodic table arranged?

  In order of increasing atomic mass
• How are periods organised?

  Repeating trends in physical and chemical properties
• How are groups organised?

  Based on similar chemical properties
• First ionisation energy definition

  The energy required to remove one electron from each atom in one mole of gaseous atoms of an element to form one mole of gaseous 1+ ions
• First ionisation energy equation

  X(g) > X+(g) + e-
• What happens to first ionisation energy across period 2 and 3?

  -Increases

  -Smaller atomic radius

  -More energy required to overcome nuclear attraction of outer electrons
• What trend does ionisation energy follow down a group?

  -Decreases

  -Atomic radius increases

  - So nuclear attraction decreases

  - Requires less energy to overcome
• The left hand side of the periodic table is likely to form

  Giant metallic lattices
• The right hand side of the periodic table is likely to form

  Giant covalent lattices
• The far right hand side of the periodic table is likely to form

  Simple covalent molecules